> > >Why drill twice?
> > >Put the scrap on the door, mark and drill.
> > >Why make things more difficult?
> > Trent
> Drill hole in scrap, center scrap, drill hole in door.
> That is drilling twice.
> Put scrap on door, mark and drill.
> That is drilling once.
> -Jack
In all this discussion about how to enlarge an already
cut knob hole, I have not seen any mention of using a special
arbor that takes two hole saws. McFeely's sells an arbor that
accepts one saw the size of the existing hole and one saw of the
larger diameter to be cut. The smaller saw guides the drill
while the second does the cutting. Barring the purchase of a
new arbor, why not just make a dowel the size of the existing
hole and having a center bore the diameter of the pilot drill
for the hole saw. Slip the dowel onto the hole saw arbor, and
use as a guide through the existing hole.
"Upscale" <[email protected]> wrote in message
news:[email protected]...
> "Dave Beyerl" <[email protected]> wrote in message
> news:[email protected]...
> > cut knob hole, I have not seen any mention of using a special
> > arbor that takes two hole saws. McFeely's sells an arbor that
>
> Actually, it was mentioned in either the first or second reply, some
twenty
> messages ago. It's still the best/easiest way to go however.
I have to disagree with this. It is only the best way if the holes are in
the same location.
When you are replacing an old lockset you may find that the backset is
identical for old and new.
You may also find that it is not.
When it is not then this approach is useless.
-Jack
There has been at least two on that subject.
"Dave Beyerl" <[email protected]> wrote in message
news:[email protected]...
>
> In all this discussion about how to enlarge an already
> cut knob hole, I have not seen any mention of using a special
> arbor that takes two hole saws. McFeely's sells an arbor that
> accepts one saw the size of the existing hole and one saw of the
> larger diameter to be cut. The smaller saw guides the drill
> while the second does the cutting. Barring the purchase of a
> new arbor, why not just make a dowel the size of the existing
> hole and having a center bore the diameter of the pilot drill
> for the hole saw. Slip the dowel onto the hole saw arbor, and
> use as a guide through the existing hole.
"JackD" <[email protected]> wrote in message news:[email protected]...
> I have to disagree with this. It is only the best way if the holes are in
> the same location.
Of course. If the centre doesn't line up with the original location, then
some other method will have to be used.